Inclined tube falling film graded liquid separation absorption device and absorption type cooling and power cogeneration circulation system

Abstract

The present invention relates to the field of absorption circulation systems, and in particular to an inclined tube falling film graded liquid separation absorption device and an absorption type combined cooling and power supply circulation system. The device comprises an outer shell, wherein a cavity of the outer shell is provided with several stages of inclined falling film absorption tube groups, each stage of which is arranged in a vertical direction; the liquid inlet of the inclined falling film absorption tube group is higher than its liquid outlet, and gas flows in from the liquid outlet and flows out from the liquid inlet; the liquid inlet of the upper stage inclined falling film absorption tube group and the liquid outlet of the lower stage inclined falling film absorption tube group are located on the same side, and the liquid outlet of the upper stage inclined falling film absorption tube group and the liquid inlet of the lower stage inclined falling film absorption tube group are located on the same side, and a liquid separator is provided at the liquid outlet of the upper stage inclined falling film absorption tube group. This improves the utilization rate of the cold source, increases the contact area between gas and liquid, increases the gas absorption efficiency, and improves the energy conversion efficiency of the circulation system.

Description

Technical Field

[0001] The present invention relates to the field of absorption circulation systems, in particular to an inclined tube falling film graded liquid separation absorption device and an absorption cooling and power co-generation circulation system based on ocean temperature difference energy and comprising the device. Background Art

[0002] Ocean temperature difference energy is a new type of marine new energy technology that uses the stable temperature difference between the warm seawater on the ocean surface and the cold seawater in the deep layer to drive the thermal circulation system to complete energy conversion.

[0003] At present, absorption-type combined cooling and power supply cycles driven by medium- and low-grade heat sources have been widely studied. However, in existing absorption-type combined cooling and power supply cycles, the high-pressure dilute solution coming out of the generator needs to be throttled by a throttle valve before entering the absorber, which causes a large amount of energy loss. In addition, after the dilute solution and refrigerant gas enter the absorber, they are absorbed by the bubbling absorption method, which has low absorption efficiency, insufficient utilization of the cold source, and cannot control the absorption concentration of the solution in the absorber.

[0004] These factors prevent the combined heat and cold energy cycle from fully utilizing the energy from the heat and cold sources, resulting in low cycle efficiency. Therefore, recovering the high-temperature energy from the generator and improving the performance of the absorber, thereby increasing the energy utilization rate of the heat and cold sources, is an important direction and approach for combined heat and cold energy cycle research. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, and proposes an inclined tube falling film graded liquid separation absorption device and an absorption-type combined cooling and power supply circulation system, which improves the utilization rate of the cold source, increases the contact area between the gas and the liquid, increases the absorption efficiency of the gas, and realizes the liquid separation flow of solutions of different concentrations to meet the different solution concentrations required in generators of different temperatures under multiple heat sources; in the double-ejector absorption-type combined cooling and power supply cycle, the heat source temperature is fully utilized through the ejector, which significantly improves the energy conversion efficiency of the entire circulation system.

[0006] The technical solution of the present invention is: an inclined tube falling film graded liquid separation absorption device, comprising an outer shell, wherein a plurality of inclined falling film absorption tube groups are arranged in a cavity of the outer shell, and the inclined falling film absorption tube groups of each level are arranged in a vertical direction;

[0007] The liquid inlet of the inclined falling film absorber tube group is higher than its liquid outlet, and the gas flows in from the liquid outlet and flows out from the liquid inlet;

[0008] The liquid inlet of the upper inclined falling film absorption tube group and the liquid outlet of the lower inclined falling film absorption tube group are located on the same side, the liquid outlet of the upper inclined falling film absorption tube group and the liquid inlet of the lower inclined falling film absorption tube group are located on the same side, and a liquid separator is provided at the liquid outlet of the upper inclined falling film absorption tube group;

[0009] The liquid inlet of the first-stage inclined falling film absorption tube group is connected to the dilute solution inlet, the liquid outlet of the first-stage inclined falling film absorption tube group is connected to the gas inlet, and the liquid outlet of the inclined falling film absorption tube group is connected to the concentrated solution outlet.

[0010] In the present invention, the inclined falling film absorption tube group comprises a plurality of inclined falling film absorption tubes spaced apart along the height direction and the width direction of the cavity;

[0011] Both ends of the inclined falling film absorber are open, and the liquid inlet end is higher than the liquid outlet end.

[0012] The multi-stage inclined falling film absorption tube group is arranged in the middle cavity of the outer shell, the bottom of the middle cavity is provided with a cooling liquid inlet, and the top of the middle cavity is provided with a cooling liquid outlet.

[0013] The liquid inlet of the inclined falling film absorption tube of the upper level inclined falling film absorption tube group is a reducer, which is gradually expanded, and the free end of the reducer has the smallest size, and an air hole is provided at the reducer;

[0014] The reducer is arranged in a closed gas channel, and the liquid outlet of the next-stage inclined falling film absorption tube group is connected to the gas channel.

[0015] One end of the liquid separator is connected to the liquid outlet, and the other end of the liquid separator is communicated with the concentrated solution channel.

[0016] The liquid dispenser comprises:

[0017] The liquid separator shell has one end connected to the liquid outlet of the inclined falling film absorber tube, and the other end is the concentrated solution outlet, which is connected to the concentrated solution channel. The bottom of the separator shell is provided with a dilute solution outlet, and the dilute solution flowing out of the dilute solution outlet flows into the liquid inlet of the next stage inclined falling film absorber tube group;

[0018] A partition plate is horizontally arranged in the middle of the liquid distributor housing;

[0019] The liquid separation guide plate is arranged on the side of the partition facing the inclined falling film absorption tube and is rotatably connected to the partition, and the rotation angle is adjustable.

[0020] The concentrated solution outlet of each liquid separator is communicated with the concentrated solution outlet through a concentrated solution channel, and a porous plate is provided between the concentrated solution channel and the concentrated solution outlet.

[0021] The present invention also discloses an absorption-type combined cooling and power supply circulation system including the above-mentioned inclined tube falling film graded liquid separation absorption device, including a liquid-gas ejector, a gas-gas ejector and a generator, wherein the outlet of the liquid-gas ejector is connected to the dilute solution inlet of the inclined tube falling film graded liquid separation absorption device, the outlet of the gas-gas ejector is connected to the gas inlet of the inclined tube falling film graded liquid separation absorption device, and the concentrated solution outlet of the inclined tube falling film graded liquid separation absorption device is connected to the liquid inlet of the generator.

[0022] The circulation system also includes a steam turbine, a condenser, and an evaporator;

[0023] The gas outlet of the generator is connected to the air inlet of the steam turbine through the reheater, the air outlet of the steam turbine is connected to the ejection fluid inlet of the gas-gas ejector and the inlet of the condenser respectively, the outlet of the condenser is connected to the hot end inlet of the second regenerator, the hot end outlet of the second regenerator is connected to the inlet of the evaporator through the throttle valve, the outlet of the evaporator is connected to the cold end inlet of the second regenerator, and the cold end outlet of the second regenerator is connected to the ejected fluid inlet of the liquid-gas ejector and the ejected fluid inlet of the gas-gas ejector respectively;

[0024] The liquid outlet of the generator is connected to the working fluid inlet of the liquid-gas ejector through the first regenerator, the concentrated solution outlet of the inclined tube falling film graded liquid separation absorption device is connected to the liquid inlet of the generator through the first regenerator, and a working fluid pump is provided on the connecting pipeline between the inclined tube falling film graded liquid separation absorption device and the generator.

[0025] The outlet of the warm water pump is connected to the generator and the reheater in sequence, the outlet of the cold water pump is connected to the cooling water inlet of the inclined tube falling film graded liquid separation absorption device, and the cooling water outlet of the inclined tube falling film graded liquid separation absorption device is connected to the condenser.

[0026] The beneficial effects of the present invention are:

[0027] (1) The inclined tube falling film graded liquid separation absorption device of the present invention can separate high-concentration liquid in time and continuously reduce the concentration of liquid-side refrigerant on the gas-liquid contact surface, thereby greatly improving the gas absorption efficiency;

[0028] (2) The inclined tube falling film graded liquid separation absorption device can separate the required solutions of different concentrations through the liquid separation guide plate in the liquid separator and the motor drive, which is used to meet the different solution concentrations required in the generators at different temperatures under the condition of multiple heat sources, and provides conditions for the absorption multi-stage evaporation joint supply cycle;

[0029] (3) The solution absorbs the gas in multiple stages in the absorption inclined tube, and the solution flow direction is opposite to that of the coolant flow direction, which increases the heat transfer area between the solution and the coolant and improves the utilization efficiency of the absorber for the cold source;

[0030] (4) The absorption cooling and power cogeneration cycle proposed in the present invention uses a liquid-gas ejector to replace the throttle valve, which reduces throttling losses, recovers the pressure energy stored in the dilute solution of the generator, and improves the efficiency of the cycle in utilizing the heat source. At the same time, a portion of the exhaust steam is ejected through the ejector and absorbed in advance, which reduces the burden on the absorber and further improves the absorption efficiency of the cycle.

[0031] (5) The circulation system realizes multi-stage utilization of the temperature of the cold and heat sources through the reheater, condenser, and inclined tube falling film graded liquid separation absorption device, thereby improving the circulation efficiency of the cycle;

[0032] (6) The circulation system can use a variety of low-grade thermal energy such as ocean temperature difference energy, geothermal energy, solar energy, and industrial waste heat. The selection of heat sources is extensive and free, and can be applied in a variety of scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the external structure of an inclined tube falling film graded liquid separation absorption device;

[0034] Figure 2 This is a schematic diagram of the internal structure of an inclined tube falling film graded liquid separation absorption device;

[0035] Figure 3 This is a front half-section view of an inclined tube falling film graded liquid separation absorption device;

[0036] Figure 4 It is a half-section view of the liquid separator in the inclined tube falling film graded liquid separation absorption device;

[0037] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle;

[0038] Figure 6 It is a structural schematic diagram of the cooling and power combined supply circulation system described in the present invention.

[0039] In the figure: 1 first regenerator; 2 generator; 3 reheater; 4 steam turbine; 5 generator; 6 condenser; 7 liquid-gas ejector; 8 gas-gas ejector; 9 second regenerator; 10 inclined tube falling film graded liquid separation absorption device; 11 throttle valve; 12 surface warm seawater pump; 13 working fluid pump; 14 deep cold seawater pump; 15 evaporator; 16 cold storage; 17 dilute solution inlet; 18 coolant outlet; 19 gas inlet; 20 stepper motor; 21 controller; 22 concentrated solution outlet; 23 coolant inlet; 24 air hole; 25 liquid separator; 26 first porous plate; 27 second porous plate; 28 first inclined tube absorption tube group; 29 first gas channel; 30 second inclined tube absorption tube group; 31 first concentrated solution channel; 32 second concentrated solution channel; 33 liquid separation guide plate; 34 temperature sensor; 35 pressure sensor; 36 diaphragm; 37 rotating shaft; 38 second gas channel; 39 intermediate solution channel. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] The following description sets forth specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art will be able to make similar generalizations without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Example

[0042] like Figures 1 to 5 As shown, the inclined tube falling film graded liquid separation absorption device of the present invention includes an outer shell, the upper part of which is provided with a dilute solution inlet 17, a coolant outlet 18, and a gas inlet 19, and the lower part of the outer shell is provided with a concentrated solution outlet 22 and a coolant inlet 23.

[0043] The outer shell is in a cavity shape, wherein a first-stage inclined falling film absorption tube group 28 and a second-stage inclined falling film absorption tube group 30 are provided in the middle of the cavity, wherein the first-stage inclined falling film absorption tube group 28 is located above the second-stage inclined falling film absorption tube group 30 .

[0044] The first-stage inclined falling film absorption tube group 28 and the second-stage inclined tube absorption falling film absorption tube group 30 are both arranged in the middle chamber. The bottom of the middle chamber is connected to the cooling liquid inlet 23, and the top of the middle chamber is connected to the cooling liquid outlet 18.

[0045] Coolant flows into the central chamber through coolant inlet 23 and out through coolant outlet 18. Heat generated during the gas-liquid absorption process in the primary inclined falling-film absorption tube group 28 and the secondary inclined falling-film absorption tube group 30 is absorbed by the coolant flowing upward. During the cooling process, the coolant temperature gradually increases from bottom to top, improving both the utilization efficiency of the cooling source and the gas-liquid absorption rate.

[0046] The primary inclined falling film absorption tube group 28 comprises several inclined primary inclined falling film absorption tubes, with multiple parallel primary inclined falling film absorption tubes evenly spaced along the width and height of the cavity. In this embodiment, the primary inclined falling film absorption tubes are evenly spaced along the height of the cavity. Each primary inclined falling film absorption tube group comprises several primary inclined falling film absorption tubes evenly spaced along the width of the cavity. The primary inclined falling film absorption tubes are all arranged in parallel. Both ends of the primary inclined falling film absorption tubes are open.

[0047] The liquid inlet of the first-stage inclined falling film absorption tube group 28 is higher than its liquid outlet. A gas outlet is provided at the liquid inlet of the first-stage inclined falling film absorption tube group 28, and the liquid outlet of the first-stage inclined falling film absorption tube group 28 is the gas inlet.

[0048] The secondary inclined falling film absorption tube group 30 comprises several inclined secondary inclined falling film absorption tubes, with multiple parallel secondary inclined falling film absorption tubes evenly spaced along the width and height of the cavity. In this embodiment, the groups of secondary inclined falling film absorption tubes are evenly spaced along the height of the cavity. Each group of secondary inclined falling film absorption tubes comprises several evenly spaced secondary inclined falling film absorption tubes along the width of the cavity. The secondary inclined falling film absorption tubes are all arranged in parallel. Both ends of the secondary inclined falling film absorption tubes are open.

[0049] The liquid inlet of the secondary inclined tube absorption falling film tube group 30 is higher than its liquid outlet. The liquid inlet of the secondary inclined tube absorption falling film tube group 30 is arranged on the same side as the liquid outlet of the primary inclined falling film absorption tube group 28. The liquid outlet of the secondary inclined tube absorption falling film tube group 30 is arranged on the same side as the liquid inlet of the primary inclined falling film absorption tube group 28. The liquid outlet of the secondary inclined tube absorption falling film tube group 30 serves as the gas inlet.

[0050] A dilute solution channel is provided at the liquid inlet of the first-stage inclined falling film absorption tube group 28, and the dilute solution channel is respectively connected to the dilute solution inlet 17 and the liquid inlet of the first-stage inclined falling film absorption tube group 28. The dilute solution enters the dilute solution channel through the dilute solution inlet 17 and enters the first-stage inclined falling film absorption tube through the liquid inlet at the top of the first-stage inclined falling film absorption tube group.

[0051] The liquid inlet of the first-stage inclined falling-film absorber utilizes a reducer. The reducer is gradually expanding, with the smallest diameter on the side facing the dilute solution channel. This gradually expanding liquid inlet significantly reduces the flow rate of dilute solution within the first-stage inclined falling-film absorber, forming a layer of liquid at the bottom of the tube that flows toward the bottom of the inclined tube under the influence of gravity.

[0052] The reducers are provided with air holes 24, and the reducers at the liquid inlets of the primary inclined falling-film absorption tubes are all located within the second gas channel 38. The liquid outlets of the secondary inclined falling-film absorption tube group 30 are connected to the second gas channel 38. Gas not absorbed by the liquid in the primary inclined falling-film absorption tubes flows into the second gas channel 38 through the air holes in the reducers. When the gas fills the second gas channel 38, it flows into the liquid outlet of the secondary inclined falling-film absorption tube group 30 and is absorbed by the liquid in the secondary inclined falling-film absorption tubes.

[0053] A liquid separator 25 is provided at the liquid outlet of the first-stage inclined falling-film absorber. The separator 25 has two liquid outlets: a concentrated solution outlet and a dilute solution outlet. A dilute solution outlet is provided at the bottom of the separator 25. One end of the separator 25 is connected to the first-stage inclined falling-film absorber, and the other end is the concentrated solution outlet.

[0054] In this embodiment, the liquid separator 25 is disposed within the intermediate solution channel 39. Therefore, the dilute solution flowing out of the dilute solution outlet at the bottom of the liquid separator directly enters the intermediate solution channel 39. The liquid inlet of the secondary inclined-tube absorption falling-film tube group 30 is connected to the intermediate solution channel 39. The dilute solution flowing out of the liquid separator 25 flows into each secondary inclined-tube absorption falling-film tube through the liquid inlet of the secondary inclined-tube absorption falling-film tube group 30.

[0055] The concentrated solution outlet of the liquid separator 25 is connected to the outer first gas channel 29. The first gas channel 29 is connected to the gas inlet 19. Gas flows into the first gas channel 29, gathers at the upper portion of the first gas channel 29, and then enters the first-stage inclined falling-film absorber tube group 28 through the concentrated solution outlet of the liquid separator 25.

[0056] A first concentrated solution channel 31 is provided below the first gas channel 29, with a second porous plate 27 positioned between the first gas channel 29 and the first concentrated solution channel 31. The concentrated solution separated by the liquid separator 25 flows into the first gas channel through the concentrated solution outlet. It then falls by gravity onto the second porous plate 27 and, through the holes provided in the second porous plate 27, into the first concentrated solution channel 31. The second porous plate 27 forms a water film on the upper surface of the concentrated solution, effectively preventing gas from flowing through the second porous plate into the first solution channel, thus providing a gas barrier.

[0057] A second solution channel 32 is provided below the second gas channel. A first porous plate 26 is positioned between the second gas channel and the second solution channel 32. The concentrated solution flowing out of the liquid outlet of the secondary inclined tube absorption falling film tube assembly 30 directly enters the second gas channel and, under the action of gravity, passes through the multiple through-holes of the first porous plate 26 and ultimately flows into the second solution channel 32. Excess liquid on the first porous plate 26 forms a water film on its upper surface, effectively preventing gas in the second gas channel from flowing into the second concentrated solution channel 32.

[0058] In this embodiment, the liquid inlet of the secondary inclined falling-film absorber also utilizes a reducer. The reducer has a gradually expanding shape, with the diameter of the tube opening facing the intermediate solution channel being the smallest. This gradually expanding liquid inlet significantly reduces the flow rate of the dilute solution within the secondary inclined falling-film absorber, thereby forming a layer of liquid at the bottom of the secondary inclined falling-film absorber, which then flows toward the bottom of the inclined tube under the influence of gravity.

[0059] After entering the dilute solution channel through dilute solution inlet 17, the dilute solution flows into the primary inclined falling-film absorption tubes through the liquid inlet of the primary inclined falling-film absorption tube group 28. Because the liquid inlet adopts a gradually expanding nozzle structure, the flow rate of the solution in the inclined tubes is greatly reduced. As a result, a layer of liquid forms at the bottom of the inclined tubes and flows toward the liquid outlet at the bottom of the inclined tubes under the action of gravity.

[0060] At the same time, gas enters the first gas channel through gas inlet 19 and enters the inclined tube through the liquid outlet at the bottom of the first inclined falling-film absorber. In this embodiment, gas passes through the concentrated solution outlet of liquid separator 25, enters the first inclined falling-film absorber from the bottom of the inclined tube, and flows toward the liquid inlet at the top of the inclined tube. During this relative flow, the gas and liquid come into contact in the first inclined falling-film absorber, and the liquid absorbs the gas. The heat generated by the liquid absorbing the gas is absorbed by the coolant.

[0061] Each first-stage inclined falling film absorber is equipped with a liquid separator at the liquid outlet. Figure 4 As shown, the liquid separator 25 includes a liquid separator housing, one end of which is fixedly connected to the first inclined falling-film absorber tube. The other end of the liquid separator housing has an opening for the concentrated solution, which is connected to the first gas channel 29. The bottom of the liquid separator housing has an opening for the dilute solution. The dilute solution opening is connected to the intermediate solution channel 39.

[0062] A horizontally arranged partition 36 is installed within the liquid separator housing. In this embodiment, the partition is fixed in the middle of the liquid separator housing, with its outer end flush with the concentrated solution outlet. A liquid separator guide plate 33 is rotatably connected to the inner end of the partition, i.e., the side of the partition facing the liquid outlet of the primary inclined falling-film absorber tube. The liquid separator guide plate 33 is rotatably connected to the partition 36 via a rotating shaft 37. The liquid separator guide plate 33 is driven by a stepper motor 20 to rotate about the rotating shaft 37. The operation of the stepper motor 20 is controlled by a controller 21.

[0063] During the process of liquid absorption of gas, a concentration gradient forms within the liquid, with the concentration gradually decreasing from the upper layer to the lower layer. As it flows through the liquid separator 25, the liquid is divided into upper and lower portions by precisely controlling the rotation angle of the liquid separation guide plate 33, according to the set separation criteria. The concentrated liquid in the upper layer flows along the upper surface of the partition plate 36 into the first gas channel 29, and then along the first solution channel 31, exiting the absorption device through the concentrated solution outlet 22. The dilute liquid in the lower layer flows through the dilute solution outlet at the bottom of the liquid separator 25 into the intermediate solution channel and into the top inlet of the secondary inclined tube absorption falling film tube group 30.

[0064] In the absorption device, the concentration gradient of the solution can be calculated based on the absorption temperature and absorption pressure of the gas and liquid, and the controller 21 controls the stepping motor 20 to drive the liquid separation guide plate 33 to rotate, so as to achieve the purpose of separating solutions of different concentrations.

[0065] A temperature sensor 34 and a pressure sensor 35 are provided on the partition 36 , wherein the temperature sensor 34 is used to monitor the absorption temperature of the gas and liquid in real time, and the pressure sensor 35 is used to detect the absorption pressure. The monitoring data is displayed in real time by the controller 21 .

[0066] During operation of the absorption device, if the concentration of the solution flowing out of the concentrated solution outlet 22 is too low, it indicates that the absorption capacity of the gas in the absorption device is insufficient. In this case, the flow rate of the solution diverted by the diverter should be increased, and the liquid separation guide plate 33 should be controlled to rotate downward, thereby reducing the concentration of the solution entering the secondary inclined tube absorption falling film tube group 30 and improving the gas absorption rate in the secondary inclined tube absorption falling film tube group 30. If the concentration of the solution flowing out of the concentrated solution outlet 22 is too high, the liquid separation guide plate 33 should be controlled to rotate upward.

[0067] The unabsorbed gas in the first-stage inclined falling-film absorption tube group 28 flows upward to the top of the first-stage inclined falling-film absorption tube, then flows out through the air holes 24 at the top reducer and into the second gas channel 38. The gas in the second gas channel flows into the absorption tube through the bottom of the second-stage inclined falling-film absorption tube.

[0068] The dilute solution obtained after separation by the liquid separator flows into the inclined tubes through the liquid inlet of the secondary inclined falling film absorption tube group 30. Similarly, a laminar liquid flow forms within the tubes, flowing under the action of gravity toward the liquid outlet at the bottom of the secondary inclined falling film absorption tube group 30. The gas not absorbed in the previous stage enters the tubes through the liquid outlet of the secondary inclined falling film absorption tube group 30, where gas-liquid convection is also used for absorption. The concentrated solution obtained after absorption flows out of the liquid outlet of the secondary inclined falling film absorption tube group 30, passes through the first porous plate 26, flows into the second concentrated solution channel 32, and exits the absorber through the concentrated solution outlet 22, completing absorption.

[0069] In this embodiment, a two-stage absorption method is employed. Similarly, the number of inclined falling-film absorption tube groups connected in series can be increased to achieve multi-stage absorption. For example, a third-stage inclined falling-film absorption tube group can be installed below the second-stage inclined falling-film absorption tube group 30. The liquid inlet of the third-stage inclined falling-film absorption tube group is located on the same side as the liquid outlet of the second-stage inclined falling-film absorption tube group, and the liquid outlet of the third-stage inclined falling-film absorption tube group is located on the same side as the liquid inlet of the second-stage inclined falling-film absorption tube group. The specific arrangement and principles are the same as those for the first-stage inclined falling-film absorption tube group and the second-stage inclined falling-film absorption tube group described above, and therefore will not be further described here.

[0070] In addition, in this embodiment, one concentrated solution outlet is used, that is, concentrated solutions of different concentrations flowing out from the first-stage inclined falling film absorption tube group 28 and the second-stage inclined falling film absorption tube group 30 respectively pass through the first concentrated solution channel 31 and the second concentrated solution channel 32 to converge into one fluid and then flow out from the concentrated solution outlet 22.

[0071] In the present application, multiple concentrated solution outlets may be provided, that is, concentrated solutions of different concentrations flowing out of the first-stage inclined falling film absorption tube group 28 and the second-stage inclined falling film absorption tube group 30 may flow out through different concentrated solution outlets.

[0072] In this embodiment, the dilute solution is diluted ammonia water and the gas is ammonia gas. In this application, water-lithium bromide, R124A-DMAC and other absorption working fluids can also be used.

[0073] The inclined tube falling film graded liquid separation absorption device can regulate the absorption concentration of the concentrated solution flowing out of the absorber, and can also make solutions with different absorption concentrations flow out of the absorber separately, thereby improving the absorption efficiency of the absorber. Example

[0074] The present application also discloses an absorption-type cooling and power co-generation circulation system including the above-mentioned inclined tube falling film graded liquid separation absorption device. Figure 6As shown, the circulation system includes a generator 2, a reheater 3, a steam turbine 4, a condenser 6, an evaporator 15, a liquid-gas ejector 7, a gas-gas ejector 8 and an inclined tube falling film graded liquid separation absorption device 10.

[0075] The gas outlet of generator 2 is connected to the air inlet of steam turbine 4 via reheater 3, while the liquid outlet of generator 2 is connected to the working fluid inlet of liquid-gas ejector 7 via first regenerator 1. The gas outlet of steam turbine 4 is connected to the ejection fluid inlet of gas-gas ejector 8 and the inlet of condenser 6, respectively. During operation, steam turbine 4 drives generator 5 to generate electricity.

[0076] The outlet of condenser 6 is connected to the hot end inlet of second regenerator 9, which is in turn connected to the inlet of evaporator 15 via throttle valve 11. The evaporator provides cooling for cold storage 16. The outlet of evaporator 15 is connected to the cold end inlet of second regenerator 9, which is in turn connected to the inlet of the ejected fluid of liquid-gas ejector 7 and the inlet of the ejected fluid of gas-gas ejector 8, respectively.

[0077] The outlet of the liquid-gas ejector 7 is connected to the dilute solution inlet 17 of the inclined tube falling film graded liquid separation absorption device 10, and the outlet of the gas-gas ejector 8 is connected to the gas inlet 19 of the inclined tube falling film graded liquid separation absorption device 10. The concentrated solution outlet of the inclined tube falling film graded liquid separation absorption device 10 is connected to the liquid inlet of the generator 2 through the first regenerator 1. A working fluid pump 13 is provided on the pipeline between the inclined tube falling film graded liquid separation absorption device 10 and the generator 2.

[0078] The inlet of the surface warm seawater pump 12 is connected to the surface warm seawater, and the outlet of the surface warm seawater pump 12 is connected to the generator 2 and the reheater 3 in sequence. The surface warm seawater pumped by the surface warm seawater pump 12 can heat the generator 2 and the reheater 3. The inlet of the deep cold water pump 14 is connected to the deep cold seawater, and the outlet of the deep cold water pump 14 is connected to the cooling liquid inlet 23 of the inclined tube falling film graded liquid separation absorption device 10, providing cooling capacity for the cooling of the inclined falling film absorption tube group in the inclined tube falling film graded liquid separation absorption device 10. The cooling water outlet 18 of the inclined tube falling film graded liquid separation absorption device 10 is connected to the condenser 6.

[0079] In this system, the heat sources utilized include not only the ocean temperature difference energy in this embodiment, but also geothermal energy, solar energy, industrial waste heat, etc.

[0080] The circulating working fluid in the system can be an absorption working fluid pair such as ammonia-water, water-lithium bromide, R124A-DMAC, etc.

[0081] The system's cyclical operation is as follows. The concentrated solution working fluid is heated in generator 2 by warm surface seawater, raising its temperature. The low-boiling-point working fluid absorbs the heat and evaporates into high-temperature, high-pressure gas. The gas is then reheated in reheater 3 and enters steam turbine 4, driving it to produce work and, in turn, generator 5 to generate electricity. After passing through the turbine, the gas's temperature and pressure decrease, with some entering gas-to-gas ejector 8 and some entering condenser 6.

[0082] The gas entering condenser 6 is cooled by the deep cold seawater, utilizing the cold source's cooling capacity and the gas's pressure energy to generate refrigeration. After cooling, the gas passes through a second regenerator 9, where it is further cooled by the fluid from evaporator 15. The gas then passes through a throttle valve 11, significantly reducing its pressure and temperature. At this point, the gas is converted into a low-temperature, low-pressure fluid, entering evaporator 15 to absorb heat and provide cooling for cold storage 16 or a cold storage station.

[0083] Another part of the gas flowing out of the steam turbine 4 is used as the working fluid of the gas-gas ejector 8 to eject part of the low-pressure gas flowing out of the evaporator 15, and then enters the inclined tube falling film graded liquid separation absorption device 10 together as the gas to be absorbed. The gas-gas ejector 8 extracts part of the high-pressure gas in the steam turbine 4 to eject the remaining low-pressure ammonia in the evaporator 15, thereby increasing the absorption pressure of the absorber 10. In addition, the ejection efficiency of the liquid-gas ejector 7 is low, and it is not possible to eject all the gas in the evaporator 15, so the gas-gas ejector 8 is added for use in conjunction. It not only recovers the pressure energy, but also increases the absorber pressure, and can also make the cycle run normally.

[0084] After the low-boiling-point working fluid in generator 2 evaporates, the remaining high-temperature, high-pressure dilute solution flows out of the generator's lower end and enters liquid-gas ejector 7. It then serves as the working fluid of liquid-gas ejector 7, ejecting the remaining low-pressure gas from evaporator 15, thereby recovering the pressure energy in the dilute solution. After ejection, the dilute solution enters inclined-tube falling-film fractional liquid separation absorption device 10, increasing the absorption pressure there.

[0085] After the dilute solution and gas enter the inclined tube falling film graded liquid separation absorption device 10, they are cooled by deep cold seawater and absorbed by graded liquid separation, becoming concentrated solution working fluid again. The working fluid is then pressurized by the working fluid pump 13, flows through the first regenerator 1 for reheating, and is then pumped into the generator 2 for reevaporation, completing the cycle. The above is a detailed introduction to the inclined tube falling film graded liquid separation absorption device and the absorption cooling and power cogeneration circulation system provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The above description of the disclosed embodiments enables professional and technical personnel in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professional and technical personnel in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention will not be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An absorption cooling and power cogeneration circulation system, comprising a liquid-gas ejector, a gas-gas ejector and a generator, characterized in that: The outlet of the liquid-gas ejector is connected to the dilute solution inlet of the inclined tube falling film graded liquid separation absorption device, the outlet of the gas-gas ejector is connected to the gas inlet of the inclined tube falling film graded liquid separation absorption device, and the concentrated solution outlet of the inclined tube falling film graded liquid separation absorption device is connected to the liquid inlet of the generator; The inclined tube falling film graded liquid separation absorption device comprises an outer shell, wherein a plurality of inclined falling film absorption tube groups are arranged in a cavity of the outer shell, and the inclined falling film absorption tube groups of each level are arranged in a vertical direction; The liquid inlet of the inclined falling film absorber tube group is higher than its liquid outlet, and the gas flows in from the liquid outlet and flows out from the liquid inlet; The liquid inlet of the upper inclined falling film absorption tube group and the liquid outlet of the lower inclined falling film absorption tube group are located on the same side, the liquid outlet of the upper inclined falling film absorption tube group and the liquid inlet of the lower inclined falling film absorption tube group are located on the same side, and a liquid separator is provided at the liquid outlet of the upper inclined falling film absorption tube group; The liquid inlet of the first-stage inclined falling film absorption tube group is connected to the dilute solution inlet, the liquid outlet of the first-stage inclined falling film absorption tube group is connected to the gas inlet, and the liquid outlet of the inclined falling film absorption tube group is connected to the concentrated solution outlet; The liquid dispenser comprises: The liquid separator shell has one end connected to the liquid outlet of the inclined falling film absorber tube, and the other end is the concentrated solution outlet, which is connected to the concentrated solution channel. The bottom of the separator shell is provided with a dilute solution outlet, and the dilute solution flowing out of the dilute solution outlet flows into the liquid inlet of the next stage inclined falling film absorber tube group; A partition is horizontally arranged in the middle of the liquid distributor housing; The liquid separation guide plate is arranged on the side of the partition facing the inclined falling film absorber tube and is rotatably connected to the partition, with an adjustable rotation angle; The concentrated solution outlet of each of the liquid separators is communicated with the concentrated solution outlet through a concentrated solution channel, and a porous plate is provided between the concentrated solution channel and the concentrated solution outlet.

2. The absorption cooling and power combined supply cycle system according to claim 1, characterized in that: The inclined falling film absorption tube group comprises a plurality of inclined falling film absorption tubes spaced apart along the height direction and the width direction of the cavity; Both ends of the inclined falling film absorber are open, and the liquid inlet end is higher than the liquid outlet end.

3. The absorption cooling and power combined supply cycle system according to claim 1, characterized in that: The multi-stage inclined falling film absorption tube group is arranged in the middle cavity of the outer shell, the bottom of the middle cavity is provided with a cooling liquid inlet, and the top of the middle cavity is provided with a cooling liquid outlet.

4. The absorption cooling and power combined supply cycle system according to claim 1, characterized in that: The liquid inlet of the inclined falling film absorption tube of the upper level inclined falling film absorption tube group is a reducer, which is gradually expanded, and the free end of the reducer has the smallest size, and an air hole is provided at the reducer; The reducer is arranged in a closed gas channel, and the liquid outlet of the next-stage inclined falling film absorption tube group is connected to the gas channel.

5. The absorption cooling and power combined supply cycle system according to claim 1, characterized in that: One end of the liquid separator is connected to the liquid outlet, and the other end of the liquid separator is communicated with the concentrated solution channel.

6. The absorption cooling and power combined supply cycle system according to claim 1, characterized in that: It also includes steam turbine, condenser, and evaporator; The gas outlet of the generator is connected to the air inlet of the steam turbine through the reheater, the air outlet of the steam turbine is connected to the ejection fluid inlet of the gas-gas ejector and the inlet of the condenser respectively, the outlet of the condenser is connected to the hot end inlet of the second regenerator, the hot end outlet of the second regenerator is connected to the inlet of the evaporator through the throttle valve, the outlet of the evaporator is connected to the cold end inlet of the second regenerator, and the cold end outlet of the second regenerator is connected to the ejected fluid inlet of the liquid-gas ejector and the ejected fluid inlet of the gas-gas ejector respectively; The liquid outlet of the generator is connected to the working fluid inlet of the liquid-gas ejector through the first regenerator, the concentrated solution outlet of the inclined tube falling film graded liquid separation absorption device is connected to the liquid inlet of the generator through the first regenerator, and a working fluid pump is provided on the connecting pipeline between the inclined tube falling film graded liquid separation absorption device and the generator.

7. The absorption cooling and power combined supply cycle system according to claim 6, characterized in that: The outlet of the warm water pump is connected to the generator and the reheater in sequence, the outlet of the cold water pump is connected to the cooling water inlet of the inclined tube falling film graded liquid separation absorption device, and the cooling water outlet of the inclined tube falling film graded liquid separation absorption device is connected to the condenser.

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